1-D Sediment Mathematical Model for Irrigation Canals of the Lower Yellow River

摘要

Most irrigation districts along the Lower Yellow River, China, suffer huge sedimentationproblems in the head area of irrigation system, including the headrace and settling basins. Thanks tothe straight channel way and regular shape of canal cross-section, a 1-D sediment mathematical modelwas build to simulate and estimate the flow and sediment movement, the volume and distribution ofsediment deposition, etc. The irrigation system is complicated with tree-structure network in layout,artificially and disorderly control drainage, high sediment concentration, etc. A novelty practicalfunction derived by analogy to simulate the sediment carrying capacity was adopted. This model wasverified by the field data from the year of 1990 to 1999 of the large-scale Weisan irrigation district,and the calculated result meets well with field data of flow, sediment concentration, sedimenttransportation and sediment deposition. Finally, some schemes of regulating operation for desiltationof the canal are put forward.